NACA00XX symmetric airfoil coordinate generator

NACA 4-digit symmetric airfoil coordinate generator with writing to file and split coordinate functions

This MATLAB function generates x- and y- coordinates of a standard NACA00XX airfoil (with non-closed trailing edge) with determined chord length and number of data points. The x-coordinates start from the trailing edge to the leading edge and return to the trailing edge.

Use input argument 'cos' to enable cosine x-coordinates, which generates denser data points near the leading edge.

Use input argument 'write2file' to enable writing coordinates to a .txt, .csv, or .dat file (or two files when coordinate split is enabled). MATLAB R2013b or newer version required if using this input argument.

Use output argument [foil_x, foil_y] or [foil_x_front, foil_y_front, foil_x_rear, foil_y_rear] to swith between continous output or splitted output in which the airfoil coordinates are splitted at the maximum thickness location.

% naca 00xx airfoil coordinates generator

% xh, 03/22/2022

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% [foil_x, foil_y] = naca00xxairfoil(naca, c, N, 'cos', 'write2file')

%

% [foil_x_front, foil_y_front, foil_x_rear, foil_y_rear] = naca00xxairfoil(naca, c, N, 'cos', 'write2file')

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% input:

% naca = 00xx;

% c = chord length;

% N = number of data points (odd number);

% 'cos' = cosine distribution of x-coordinate from leading edge;

% 'split' = split coordinates into front and rear at maximum thickness;

% 'write2file' = write to .txt, .csv, or .dat file, two sets of files if coordinate split enabled;

% 'write2file' can be 'txt', 'csv', or 'dat';

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% output:

% [foil_x, foil_y]

% foil_x = x-coordinate vector, trailing edge -> leading edge -> trailing edge;

% foil_y = y-coordinate vector, trailing edge -> leading edge -> trailing edge;

%

% [foil_x_front, foil_y_front, foil_x_rear, foil_y_rear]

% foil_x_front = x-coordinate vector, max thickness -> leading edge -> max thichness;

% foil_y_front = y-coordinate vector, max thickness -> leading edge -> max thichness;

% foil_x_rear = x-coordinate vector, max thickness -> trailing edge -> max thichness;

% foil_y_rear = y-coordinate vector, max thickness -> trailing edge -> max thichness;

%

% examples:

% linear x-coordinates without writing to file:

% [foil_x, foil_y] = naca00xxairfoil(naca, c, N)

%

% consine x-coordinates with writing to a .txt file:

% [foil_x, foil_y] = naca00xxairfoil(naca, c, N, 'cos', 'txt')

%

% linear x-coordinates splitted at max thickness with writing to a set of .csv file:

% [foil_x_front, foil_y_front, foil_x_rear, foil_y_rear] = naca00xxairfoil(naca, c, N, 'csv')

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